Screening or separating machine.



T. L. & T. J. STURTEVANT.

SCREENING 0R SEPARATING MACHINE.

APPLICATION FILED HAY4, 1910 Patented Aug. 13, 1912.

3 SHEETS SHEET l.

Z hu'culum T. L. & T. J. STURTEVANT. SCREENING 0R SEPABA'IING MACHINE.

APPLIUATIOH TILED HAY4,1910.

Patented Aug. 13, 1912.

3 BHIIETS-BBEET 2.

au ueutow Wm WMM W T. L. & T. J. STURTEVANT.

SCREENING 0R SEPARATING MACHINE.

APPLICATION TILED HAY4.1910. 1 335,262, Patented Aug. 13,1912.

3 SHEETS*SHEET 3.

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THOMAS LEG'GI'ITT STURTEVANT. OF QUINCY. AND THOMAS JOSEPH STURTEVANT, F WELLESLEY, MASSACHUSETTS, ASSIGNORS 'lO STURTEVANT MILL COMPANY, A

CORPGRATION OI MAINE.

SCREENING OR SEPARATING MACHINE.

Specification of Letters Patent.

Patented An". 13, 1912.

1'0 all whom it may concern.

Be it known that we, 'lnouis ll. S'ri'lrtlr VANT and Tnonas (l. ti'rt'nrnvixi'. both citizens of the United States. residing, l'tnl'ltt tively, at Quincy and lYellr-slev. in the county of Norfolk and State of illasrachusetts, have invented or discovered certain new and useful lnolu'oremcntu in Screening);

0r Separating Mae lines, of which the :fol-

sereenin all) lowing is a specification. relerence being had therein to the accompanying drawings.

This invention relates to that class of screening or separating ltltttllllltfn in which the screens are jarred bypercusuive action, and the invention has tor itu object to pro- -vidc a screening or separating; much-inc, ol the character referred to, which will etl'ectively perform the function for which it is intended, and which isndapted tor rapid action so as to secure a large output.

In the accompanying drawings, Figure .tis a sectional side View of the improved or separatlin machine, and Fi 53 is an eevation thereof. Fig. 3 is a detail View of one of the screens, and Fig. it an edge view or" the same. Fl 5%, t3, 1' and S are, detail views illunlrnting, ifi'erent tornn: of the percuiwive moch l lleit tto the suitable fran cavern ix. which is mounted a nhat'l; tit prorided with a drivit pulley ll, said driv ing shaft par. 1g through a l'ecd. llm' to and herring to opet a t'eerl lg; screw ll, which will distribute materix-d, entering from the hopper 17, in the said .tecd box. ()ne wide of the said 'l'ccd box ln'ctcrubl}; con|- prises a plate 18 having an inclined upper edge, so as to he of a gradually t lttl'tllhlllg' height. away from the hopper. and over V which plate the material to he led in l'orwsd by the Slllt'l feed screw.

shaft 13.

...l;l hammers 24:, although, if desired, the

rollers may be omitted and the crank pins on which the rollers are mounted may serve to engage the hammers directly. The hammers ri l are mounted on fixed pivot pins 95 mpporled by uprights 2G projecting from cross bars 27 which are sustained by the frame 12.

In the preferred form of the invention herein shown the improved screening machine or :a-parator pretcrabl (olnpristS a plurality of screens 28, ill and :30. each of said screens consisting of a suitable l'rame rigidly mounted on the .l'ramework 1'. of the screening machine or separator and to which screen frame is suitably attached the woven wire or screen clothing conatitutiug the screen proper. in this embodiment of the invention comprising a plurality of screens, disposed one above the other, the upper screen will preferably consist. of a relatively ermine-mesh heawvuvire screen which will remove the coarser parts of the material being separated, and thus avoid injury and unnecessary wear of the screen clothing of the finer screens beneath, this upper, coarse-mesh screen being termed a seulping screen. In the present. machine the, screen clothing of the lower screenu Q9 and 30 will preferably be ct equal tine mesh. an that the output of these two fine mesh screens will be of equal lllltllLhS. All of these s reens, as will be understood, are mounted in an inclined position, as shown in hip. .t', and the upper end of the ocreen 330 is arranged so as to extend beyond the upper end of the screen 9). With this arrangement of the two fine mesh screens, properly set. about an equal amount of material will be led to each through the coarser ecalping;- M'l'tt'll 2h. The. material as it is led from the feed box 15 onto the scalping screen 28 in usually reduced to such a degree ot fineness that a considerable portion of the material will immediately pass through the upper end of the scalping screen 28 onto the screen 30, and from this it will result; that the remainder or about an equal amount of material can be fed to each of the fine-mesh rereeus, as above stated. The feed of the material onto the lower screen 30 may be regulated by changing the position of an adjustable cross bar or receiving plate '31 Q messes onto whicli; the material passing over thethe scalping screen onto the lower screen 30 may be varied as may be desired. The receiving or blanking plate 31 is arranged practically in the same plane as the scalping screen 28, and the material coming from the feed box fall's onto the said receiving and blanking plate 31, and iron; thence slides directly onto the sce'lping screen, so thatt -he said receiving plate avoids wear which otherwise might be occasioned.v at the upper end of the scalping screen by the impact of falling material, Much of the crushed material handled by the class of separators to which this invention relates is of a hard and sharp character such as would occasion con- .airame consistin bars 37, the side ars being provided. with siderable wear-by. falling impact, partidn- Ierly of the coarser parts of such material. B virtue of the receiving plate 31, onto which the material falls and from which it slides to the scalping screen, undue wear at the top portion of the latter willbe avoided, as wil e understood.

Beneath the hammers are arranged the I impact bars 32 which pass through suitable 49 and the lower ends" of which are preferably arranged. to be in contact with protecting plates 50 on bars 33 overlying the wire cloth screen clothing 34: of the fine mesh screens, so that the screen clothing will not be injured by the percussive action of the said impact bars. These impact bars are preferably arranged in pairs, as shown, and are rovided at their upper ends with caps 35 W ich are acted directly upon by the hammers 24, and which thus serve to distribute the force of the blows of the hammers about equally between the two impact bars of the air; The different he rs of each pair act on ifierent screens, so that a single hammer Will serve to jar a plurality of screens between which the percussive impact of the hammer will be divided. To provide for a variation of the list of the hammers 2 and thus vary the force of their strokes, the

boxes 19 in which the shafts 21 are journalcd,

are made vertically adjustable by inserting a greater or lesser number of shims 19 be tween said boxes and their sup ports 20.

Each of the screens prefers ly comprises of side bars 36 and end plates 38 into which extend the ends of tension rods 39 passing through plates 40 on the 1 protecting bars 83. The end portions of the rods 39 are screw-threaded, and on the threaded portions of said rods are mounted nuts 41 hearing against the inner ends of the plates 38 or against the inner-sides of the side bars 36. The screen clot-hing will be attached in any suitable manner with the side bars 36, and as the said bars are inov ably mounted, by virtue of pin-an'd slot connections, on the end bars 37, it will be evident that by screwing up the nuts it the wire mesh screen clothing attached to the said side bars may be suitably stretched, or

placed under'any suitable de ree of tension,

as is desirable in order teens le it to have a proper vibreting eirect. 1th this improved construe on, whereby the tension of the wire mesh screen -clothing may be positively adscreen; Mowing the slide plate up increases the surface of the scalping screenover the lower fine screen 30 and permits e g-renter portion ot the product passing through the scnlping screen to go to the lower screen. itwill thus be seen that the product passing the seal ing screen can be easily divided between t e two fine screens; cutting oil a p0rtion of the feed to one screen increases the amount of material fed to the other, and

price versa. This adjustment of the plate 31 may be effected by virtue of the slotted flanges 31* at the ends of said plate and through which pass the bolts 31* by which said plate is secured in any desired position. Instead of arranging the hammers 24's) that their free ends are lifted by the revolv- Lug cranks rolls, as shown in Fig. l the said hammers may be provided with short. arms 42, extending beyondtheir pivot'pins, and which short arms may be acted upon by the revolving cranks to lift the said ham" mers, shown in Figs. 5 and 6. The harniners Bel may operate either simply by gravity, as shown in Figs. 1 and 5, or they have their action accelerated by means of springs'fi, as shown in Fig. 6.

Instesd of employing hammers for 'or by the Weight of said bars augmented by coiled springs 44 arranged as shown in Figs. 7 and 8, where the said bars are rep'resented as being provided with collars 4C5 forced by the action of the springs, 4% against rotating lifting cams or tappets 4:6

arranged to raise two impact bars sirnul weight of the lunumem or percussion part5.

Also in this improved -onstruction the deadening ettect on the vibrations; oi the screen, such no results in some prior constructions in which the hammers have more or less drug on the impact bars :it'ter (lQll\'- ering their strokes, is nvoided.

Beneath the screenri'is arranged on mclmed lloor t? which has: an angle ct 1nelinntion greater than that ol' the inclinedscrcens. This lloor is preferably removzihly secured in place by means of cl'eWS and thumb nuts no as to serve us it door which may be rendily removed. when access to the screens is desired, or the said screens muy he placed in position, before the removable floor or door is sccurei'l in place, through the opening or aperture afterward closed by the said removable tioor or door. lly iii-runging lileblttitl floor or door at n steeper angle than the tingle of inclination of the screens, :1 tree discharge oi the'i'mtteriol passing through the lower screen will be provided for. The Rcreei'ied material passing through the upper line-mesh screen 29 will he received in the pain or reccydncle t8 interposed lNl'Si'ilflIl said screen and the lower tine-numb screen 30, mid the Stiltl pan or rerepluclc uuty be open at. its lower end for the Free discharge oi? the screened nmtcrial.

From the 't'oregroinc, it will be understood that the present invention or imiiirovement provides a screening or separating machine in which the screen lrnmeze are, rigidly supported or ri, idly mounted on the nmchine frame and in which. the sarreeirclothing is positively adjusted to any desired tension on the screen lrmncs end is positively held under such tension; while the improved coir str'uction also prtwides :1 plurality of percu civcly agitated tire mesl'r's m; which are more or le-w; ted, by the overlying comwu -n) on "till-HQ s reen, lronr the wear which might herwise be cuuoed by course pier of nmterizil. Also the tw screens give, in this plurtti arrangement. double. the lit e, output ct' no ordinary single line screen, l-lHc-;-;til:1iniu;, n. doubled. output at. it coct not much in excess of that of a single line mech orreen separator.

he invention is not to he mulerslood as being limited, liowerer, to any particular number of screens, or to the use of a conrsemesh scalping screen in connection with two line-mesh screens agitated by the improved jarring mechanism herein shown, as this jarring mechanism may he used in connection with one, two, or more fine'mesh screens, of equally fine or of varying mesh, with or without- :1 protecting coarse-mesh or enlping screen. Also the details of the improved screening or so mrnting machine may be otherwise varied withoutdeparting from the scope o essence of the present invention.

Having thus described our invention, we claim and deSi re to secure by Letters Patent:

1. In a separator, the combination with a plurality of screens, of percussive means for agitating said screens comprising impact bars in pairs, a cup on each of the said pairs of impact. bars, and vibrating hammers acting: percuscivcly on said cops.

9. To a oepnrutor, the combination with a plurality of inclined screens comprising wire mesh screen clothing having protecting plates or surfaces, of percussive means comprising impact bars in pairs normally in contact with said protecting plates or surffttCQ, a cap on each of the said pairs of impact bars, vibrating hammers acting percussively on said caps, and rotating means for lifting said lmmmers.

3. In in. separator, the combination with a plurality of inclined screens comprising wire mesh screen clothing provided with protecting plates or surfaces, of percussive means for agitating or jarring the said screens, said percussive means comprising impact bars, in pairs, rt cup on each of said pairs of impact bars, and a vibrating hammer acting percnssively on each of said caps, the diti'crent bars of each pair acting on different screens.

4. In a separator, the combination with a plurality of inclined, rigidly mounted screens comprising Wire mesh screen clothing provided with protectin plates or surfaces, of percussive means 'or agitating or jarring the screen, said percussive means comprising import bars, in pairs, it cap on each of the said pairs of impact bars, and vibrating hammers acting percussively on said cups, the dill'erent bars of each pair acting on dillercnt screens.

5. In a separator, the combination with one or more inclined screens, ofimpact-bars independent of and acting pcrcussively on said screen or screens, pivoted hammers acting on said impact-burs, means for lifting said hammers, and. means for varying the 'li'ttin movements of said hammers.

l. n e. separator, the combination with one or more inclined screens, of impact-bars imlri'rendent of and acting percussively on scid screen or screens, pivoted hammers octine; on said impact-bars, rotating shafts, menus carried by said shafts, for lifting said hammers, boxes in which said shafts are journaled, and means. for varying the lifting movements of said hammers, said varying means com rising shims, a greater or lesser number 0 which'mey be inserted beneath said boxes to raise or lower the same.

7. In .a separator, the combination with one or more inclined screens, of independent impact-bars loosely engaging said screen or screens, and vibrating, spring-accelerated hammers acting on said impact-bars.

8. In a separator, an inclined, coarse-mesh or scalper screen, a plurality of inclined fine-mesh screens beneath said coarse-mesh screen, and adjustable means whereby more or less of the product passing through said coarse-mesh screen may be dlvided between the said fine mesh screens and discharged onto them.

9. In a separator, an inclined, coarse-mesh or scalpel screen, a plurality of inclined fine-mesh screens beneath said coarse-mesh screen, a partition between said fine-mesh screens, and aojustable meens whereby more or less of the product passing through saici coarse-mesh vscreen may be discharged onto either of said fine-mesh screens.

10. In separator, a coarse mesh or scalping screen, in combination one or more fine screens ancl a plate arranged to cover a part of the surface of said scalping screen, and thus prevent said surface from delivering its product except at E/redetermined pieces. Y

, 11. In a separator, a coarse mesh or scalping screen, in combination one or more fine screens, and an adjustable plate to vary the places at'which said scalping screen will deliver its product to the said fine screens.

In testimony whereof we afix our signatures, in presence of two witnesses.

THOMAS LEGGETT gTUR'iEVAliT. THQMAS JOSEPH STURTEVAHTA Witnesses: A N. STURTEVANT, A. ToMnrNsoN. 

